Remove pdf export code

Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de>

docs/setup/docker-linuxserver.md

@@ -2,7 +2,7 @@
 
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-[LinuxServer.io](https://linuxserver.io) have created an Ubuntu-based multi-arch container image for x86-64, arm64 and armhf which supports PDF export from all architectures using [PhantomJS](https://phantomjs.org/).
+[LinuxServer.io](https://linuxserver.io) have created an Ubuntu-based multi-arch container image for x86-64, arm64 and armhf.
 
 - It supports all the environment variables detailed in the [configuration documentation](../configuration-env-vars.md) to modify it according to your needs.
 - It gets rebuilt on new releases from HedgeDoc and also weekly if necessary to update any other package changes in the underlying container, making it easy to keep your HedgeDoc instance up to date.